M923 pulling M989 Hemat trailer

[PowerstrokeNC]

Hope you guys can help...

I hooked up my HEMAT trailer to the 5 ton (M923 A1), completed all the necessary hookups, wiring, air (inc emergency line). Trailer pumped up on airbags all looked good. Tried to pull off & all four wheels are locked (brakes on).

So I checked everything again, made sure all valves were turned on both on the trailer and truck, tried again, still locked.

Tried pushing the emergency brake release on the trailer, nothing happened & still locked.

So I turned off the valve going to the emergency line and disconnected it, still locked.

So then I turned off the main/working line and disconnected it and the front brakes released BUT back brakes still were locked.

So I pushed the emergency brake release on the trailer and it popped in and the back brakes released.

At this point I am not sure whats going on.

Any help would be appreciated.

Thanks in advance.

Derick

 

[juanprado]

Did you have the hoses crossed as I hooked them up straight on a m105 as the tm showed and I learned the hard way that was not correct. Most military trailers have the hoses crossed I learned.
.

 

[goldneagle]

Yep what he said! Had that happen to me the first time I hooked up a military trailer to my truck on a recovery. Now I know better! Cross the hoses when hooking up.....

 

[1 Patriot-of-many]

And no pics. total fail.

 

[markmontana]

Cross the airlines- oops- already mentioned. Sorry. Moving on- nothing new here...

 

[PowerstrokeNC]

Some pics

 

[PowerstrokeNC]

Yep! crossing the hoses did it, the minute you mentioned that and I went out there to look it was clear as day... LOL thanks again guys!